I took some photographs of the plume of smoke while riding on the DLR from Tower Gateway towards Westferry. I was stopped by a police officer who identified herself as part of a counter-terrorism team and interrogated for maybe 15 minutes as to why I was taking the photos and then had an official Stops and Searches citation filled out. The officer was considerate and courteous as required. It was explained to me that arsonists frequently like to take photos of the fires they start. And even though we were miles away, she said that "you never know who might be a terrorist or the arsonist". Interesting huh...